Wordpress - Given a WP_Query, how can I get a list of tags?
For the sake of posterity, I ended up just iterating through the loop twice: once to get the tags, and then to actually display the page.
Here's my code:
if ( have_posts() ) :
// get tags for found posts
$recent_tags = array();
while ( $loop->have_posts() ) : $loop->the_post();
foreach(get_the_tags() as $t) $recent_tags[$t->slug] = $t->name; // this adds to the array in the form ['slug']=>'name'
endwhile;
// de-dupe
$recent_tags = array_unique($recent_tags);
// sort
natcasesort($recent_tags);
// do something with the array
while ( $loop->have_posts() ) : $loop->the_post();
// normal wp loop